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View Full Version : Why Mpeg2



jjjones
03-09-2003, 11:59 PM
I have been playing with some of the tools found on DVDhelp and Doom9 and like the results I have obtained with the DivX and XviD codecs. There is also discussion on some baords that these codecs are "the next generation" codecs since they outperform MPEG2 on HD streams.

Using DivX, I can shrink a 2.2G TyTool m2v file into a 800M avi. There is slight conversion loss. I would not use it for LOTR. I would use it for sitcoms.

MPEG2 to DivX conversion takes time. I average 21fps. So whatever compression benefit I get by using the codec is spend on conversion wait time.

Is the Tystream hardcoded to MPEG2 or could the stream be decoded to say, DivX?


jj

dlang
03-10-2003, 02:38 AM
the ty stream is mpeg2 you have to re-encode it to anything else

jdiner
03-10-2003, 04:07 AM
The tivo, both SA and DTV versions, record in Mpeg-2. I am not "making" the audio and video. I am just re-formatting things into a form that can be used by other things. If you want to re-encode do so.

I have been somewhat successful with a frame server like the one found in DVD2AVI, which was honestly a sweet one. It could be finished at some point to make transcoding much easier. It was not something that I wanted for me. It was just a curiosity honestly...

--jdiner

jjjones
03-10-2003, 09:06 AM
Thanks Josh. That's what I figured. 4 movies on a DVD would have been nice.

jj

jdiner
03-11-2003, 04:03 AM
Yeah. I have heard rumors and early info release posts about DVD hardware players that support DIVX, i.e. MPEG-4. It those rumours turn out to be true it would be worth an upgrade for some. I would be amoung them... :)

--jdiner

misato
03-11-2003, 04:37 AM
FWIW, Sigma Designs has an MPEG4 card called the X-Card, which is similar in general principles to their MPEG2 Hollywood Plus playback card.

It's been a while since I checked, but the last time I looked through their user forums, there were an incredible number of problem reports and much screaming about buggy drivers.

That device may have improved, and there may be (probably are) other MPEG4 based playback devices coming, but for now, I consider MPEG2 a mature technology with good enough compression for my use. YMMV, of course. My goal is NTSC playback to a television, not a PC screen, and that may also differ from some folks' end goals.

Oh yes. For fear of a particular software giant in Redmond, their card will never play back DIV3. They've made that pretty clear...

FredThompson
03-17-2003, 05:35 AM
Some of the hardware players at CeBit are claiming MPEG4 format and even (gasp) DivX 3 and 4. Could be a very nice Christmas this year ;)

Wooly
03-17-2003, 09:08 PM
We have 2 players right now in this arena, both are currently on the market (and one of the players even has an Ethernet port that allows streaming from a PC!!!):

http://www.scott.de/html/_englische_site/produkte/dvd/dvd_842/right.html

and the other biggie:

http://www.kiss-technology.com/projects/dvd_450.asp?id=109

BTW, here's a link to the unit with Ethernet (but it's running around $350 right now, so it's a bit pricey for what it is):

http://www.kiss-technology.com/projects/dvd_500.asp?id=109

As always, research before you buy - here's an excellent site to do so, and these players are all available for review here:

http://www.dvdrhelp.com/dvdplayers